ABCD

Example

A
B
B
_
A
B
C
12
B
A
C
12
5
_
19
 
 
A
B
C
_
_
_

Solution

A
B
B
7
A
B
C
12
B
A
C
12
5
7
19
 
 
A
B
C
1
3
8
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ABCD
ABCD

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